I honest to god believe that we can have these in real life if we invest in engines, thrusters, and power supplies. The whole transforming bit is already possible, with various models so it couldn't be to big of a stretch. The actual thing would probably be massive and need to go at insane speeds to carry it's own weight. Though we can accomplish that. The real issue is really just the power supply, engines and thrusters. Some engines and thrusters could work in this instance though it would probably be safer to make those specific to the vehicle.